Veena Raghavan on sat 24 mar 07
Hi Folks
Some time ago, someone wrote about testing a Kemp 7 pale blue with specks and
said it was in the archives. I have searched the archives but cannot find
this glaze. If anyone has tested it and would share the recipe, I would love to
test it too!
Thanks in advance.
Veena
VeenaRaghavan@cs.com
Eric Hansen on mon 26 mar 07
Veena: I have those archives. They are not in ClayArt
but in another. Are you still in the D.C. area? Call
me late afternoon 202-471-4025
E R I C H A N S E N
a kansas potter in washington DC
--- Veena Raghavan wrote:
> Hi Folks
>
> Some time ago, someone wrote about testing a Kemp 7
> pale blue with specks and
> said it was in the archives. I have searched the
> archives but cannot find
> this glaze. If anyone has tested it and would share
> the recipe, I would love to
> test it too!
>
> Thanks in advance.
>
> Veena
>
>
> VeenaRaghavan@cs.com
>
>
______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change
> your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be
> reached at melpots@pclink.com.
>
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Maurice Weitman on mon 26 mar 07
Veena wrote:
>Some time ago, someone wrote about testing a Kemp 7 pale blue with
>specks and said it was in the archives. I have searched the archives
>but cannot find this glaze. If anyone has tested it and would share
>the recipe, I would love to test it too!
Hello, Veena and glazers everywhere...
Along with the clayart (discussion) archive, there are others,
including the clayart glaze database archive described on and
available from (http://ceramics.sdsu.edu/glazedatabase.html).
Near the bottom of that page, one may download the database (alas, it
seems to have been last updated 1/15/96) in several formats,
including plain text and Insight.
Within it is the Kemp 7 glaze you sought:
Glaze name: Kemp 7
Cone: 6 - 7
Color: Pale blue with darker flecks
Testing: Untested
Surface texture: Semi-Matte or Satin
Firing: Ox. or Red.
Glaze type:
Recipe: Percent Batch
Nepheline Syenite 22.35 111.8
Wollastonite 22.35 111.8
Gerstley Borate 20.11 100.6
Ball Clay 11.17 55.8
Barium Carbonate 11.17 55.8
Zirconium Silicate 10.06 50.3
Lithium Carbonate 2.79 13.9
Totals: 100.00 % 500.0 Gm
Also add:
Cobalt Oxide 1.12 5.6
Comments: Semi matt. Pale blue with darker flecks. Darker blue where
pooled or thick
Let us know how you like it!
Regards,
Maurice, hoping to finally catch up from having been away for a
wonderful week (who cares about the airline dodo?) in Louisville with
many of you. More later.
Eric Hansen on wed 28 mar 07
Thanks for the link partner. My kemp # 7 says:
>#7. Cone 6 7 0xidation
>Nepheline Syeniye 20
>Wollastonite 20
>Gerstley Borate 18
>Ball Clay 10
>Barium Carbonate 10
>Zirconium Silicate 9
>Lithium Carbonate 2.5
>Cobalt Oxide 1
>Semi matt. Pale blue with darker flecks. Darker blue
where pooled or >thick.
And that is straight from Kemp his self.
H A M B O N E
p.s. where oh where is
mishy???
--- Maurice Weitman wrote:
> Veena wrote:
>
> >Some time ago, someone wrote about testing a Kemp 7
> pale blue with
> >specks and said it was in the archives. I have
> searched the archives
> >but cannot find this glaze. If anyone has tested it
> and would share
> >the recipe, I would love to test it too!
>
> Hello, Veena and glazers everywhere...
>
> Along with the clayart (discussion) archive, there
> are others,
> including the clayart glaze database archive
> described on and
> available from
> (http://ceramics.sdsu.edu/glazedatabase.html).
>
> Near the bottom of that page, one may download the
> database (alas, it
> seems to have been last updated 1/15/96) in several
> formats,
> including plain text and Insight.
>
> Within it is the Kemp 7 glaze you sought:
>
> Glaze name: Kemp 7
> Cone: 6 - 7
> Color: Pale blue with darker flecks
> Testing: Untested
> Surface texture: Semi-Matte or Satin
> Firing: Ox. or Red.
> Glaze type:
>
> Recipe: Percent Batch
> Nepheline Syenite 22.35 111.8
> Wollastonite 22.35 111.8
> Gerstley Borate 20.11 100.6
> Ball Clay 11.17 55.8
> Barium Carbonate 11.17 55.8
> Zirconium Silicate 10.06 50.3
> Lithium Carbonate 2.79 13.9
> Totals: 100.00 % 500.0 Gm
>
> Also add:
> Cobalt Oxide 1.12 5.6
> Comments: Semi matt. Pale blue with darker flecks.
> Darker blue where
> pooled or thick
>
> Let us know how you like it!
>
> Regards,
> Maurice, hoping to finally catch up from having been
> away for a
> wonderful week (who cares about the airline dodo?)
> in Louisville with
> many of you. More later.
>
>
______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change
> your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be
> reached at melpots@pclink.com.
>
____________________________________________________________________________________
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Ron Roy on fri 30 mar 07
Hi Veena,
This is a very unstable glaze and will leach - among other things - lithium
and barium into acidic food. It will leach cobalt and change colour if in
contact with mild acids especially if in contact with them for a long time.
In other words - should not be used as a liner glaze - unless customer
dissatisfaction is the aim.
It will probably not stand up to dishwashing in a dish washer very well either.
RR
>Veena wrote:
>
>>Some time ago, someone wrote about testing a Kemp 7 pale blue with
>>specks and said it was in the archives. I have searched the archives
>>but cannot find this glaze. If anyone has tested it and would share
>>the recipe, I would love to test it too!
>
>Hello, Veena and glazers everywhere...
>
>Along with the clayart (discussion) archive, there are others,
>including the clayart glaze database archive described on and
>available from (http://ceramics.sdsu.edu/glazedatabase.html).
>
>Near the bottom of that page, one may download the database (alas, it
>seems to have been last updated 1/15/96) in several formats,
>including plain text and Insight.
>
>Within it is the Kemp 7 glaze you sought:
>
>Glaze name: Kemp 7
>Cone: 6 - 7
>Color: Pale blue with darker flecks
>Testing: Untested
>Surface texture: Semi-Matte or Satin
>Firing: Ox. or Red.
>Glaze type:
>
>Recipe: Percent Batch
>Nepheline Syenite 22.35 111.8
>Wollastonite 22.35 111.8
>Gerstley Borate 20.11 100.6
>Ball Clay 11.17 55.8
>Barium Carbonate 11.17 55.8
>Zirconium Silicate 10.06 50.3
>Lithium Carbonate 2.79 13.9
>Totals: 100.00 % 500.0 Gm
>
>Also add:
>Cobalt Oxide 1.12 5.6
>Comments: Semi matt. Pale blue with darker flecks. Darker blue where
>pooled or thick
>
>Let us know how you like it!
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Ron Roy on fri 30 mar 07
Hi Eric,
It only adds to 89.5 without the cobalt - we playing with a full deck here?
It's still way short of silica and alumina so it's still unstable.
RR
>Thanks for the link partner. My kemp # 7 says:
>
>>#7. Cone 6 7 0xidation
>>Nepheline Syeniye 20
>>Wollastonite 20
>>Gerstley Borate 18
>>Ball Clay 10
>>Barium Carbonate 10
>>Zirconium Silicate 9
>>Lithium Carbonate 2.5
>>Cobalt Oxide 1
>>Semi matt. Pale blue with darker flecks. Darker blue
>where pooled or >thick.
>
>And that is straight from Kemp his self.
>H A M B O N E
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Eric Hansen on sat 31 mar 07
Ron: You're absolutely right. But that is the version
I got on file. Can't say but maybe Kemp dropped an
ingredient. Lots of these things happen in the pottery
world. It should have been recaculated I suppose to
100% or we should have been told why it wasn't 100%
but Kemps notes are in the manner of Chappell's - you
just have to try them to see what they do I guess. I
don't know. I could go back to the earliest copy of my
files if I had a PC available to read my "Chit-Chat"
files. But I don't. I have a feeling it wouldn't
matter. When someone says they have heard of a glaze
online and it's not in the archives, somehow I usually
have the recipe. But recipes are just numbers, they
don't even specify exactly which material
(flint,whiting) to use. And the numbers are sometimes
wrong. And sometimes the glaze is just not good.
E R I C
--- Ron Roy wrote:
> Hi Eric,
>
> It only adds to 89.5 without the cobalt - we playing
> with a full deck here?
>
> It's still way short of silica and alumina so it's
> still unstable.
>
> RR
>
>
>
> >Thanks for the link partner. My kemp # 7 says:
> >
> >>#7. Cone 6 7 0xidation
> >>Nepheline Syeniye 20
> >>Wollastonite 20
> >>Gerstley Borate 18
> >>Ball Clay 10
> >>Barium Carbonate 10
> >>Zirconium Silicate 9
> >>Lithium Carbonate 2.5
> >>Cobalt Oxide 1
> >>Semi matt. Pale blue with darker flecks. Darker
> blue
> >where pooled or >thick.
> >
> >And that is straight from Kemp his self.
> >H A M B O N E
>
> Ron Roy
> RR#4
> 15084 Little Lake Road
> Brighton, Ontario
> Canada
> K0K 1H0
>
>
______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change
> your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be
> reached at melpots@pclink.com.
>
____________________________________________________________________________________
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Donna Kat on sat 31 mar 07
Thank you very much for looking at this. It just never occurred to me that
stirring might be an issue but with students that often are not properly
monitored when they are glazing, this would certainly be an option.
The matt I was certain was a firing issue and John confirmed this. The
running had me baffled because I really did not want to risk making the
glaze not stable. I was thinking of lowering the copper and throwing in
just a tad F4.
I appreciate the attention you have given this. Donna
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